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A fun, free platform for learning modern cryptography

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Learn By Doing

Learn about modern cryptography by solving a series of interactive puzzles and challenges. Get to know the ciphers and protocols that secure the digital world by breaking them.

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Level Up

Earn points by solving challenges. Finish categories to earn trophies and gain levels to track your progress. Can you reach the top of the scoreboard?

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Fresh Challenges

We are constantly creating new challenges to keep your crypto knowledge up to date. Expect exciting brainteasers and whole new categories as the site continues to grow.

New Challenges
GLP420 (HackTM CTF) CTF Archive 0
unrandom DSA (HackTM CTF) CTF Archive 0
kaitenzushi (HackTM CTF) CTF Archive 0
d-phi-enc (HackTM CTF) CTF Archive 0
broken oracle (HackTM CTF) CTF Archive 0
Weekly Top Users
#1 dkp 2190
#2 Yvain 2045
#3 Oscarism2401 1920
#4 gratigo 1620
#5 yenmeomeo 1370
Recent Solves
XOR Starter larryhius
RSA Starter 2 kunkun
Confusion through Substitution Haze
Square Eyes rennanrocha
XOR Properties whynotkimhari
Recent Solutions
ECB Oracle mohnah_0B 0
Modular Arithmetic 2 goodmai 0
RSA vs RNG HommePuissant 0
Favourite byte sky9262 0
Paper Plane 1s0m0rph1sm 0

Level Up

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